Robert friedel



(No Mbdel.)

. R. PRIEDEL. MACHINE FOR GEINDING OVAL GLASSES.

No. 465,695. Patented Dec. 22, 1891.

' frame in the manner hereinafter set forth,

UNITED STATES PATENT OFFICE.

ROBERT FRIEDEL, OF STUTTGART, GERMANY.

MACHINE FOR GRINDING OVAL GLASSES.

SPECIFICATION forming part of Letters Patent No. 465,695, dated December22, 1891.

Application filed May 2, 1891. gerial No. 391,360. (No model.)

To all whom it may concern.-

Be it known that 1, ROBERT FRIEDEL, a citizen of the Kingdom of\Viirtemberg, residing at Stuttgart, iirtemberg, Empire of Germany, haveinvented a new and useful Improvement in Machines for GrindingOvalGlasses, of which the following is a specification. I

My present invention relates to that class of grinding-machines in whicharticles of a circular or oval form are ground or beveled, and moreespecially to that class of machines in which a chuck or clamp whichclamps the article to be ground is adapted to rock with respect to afixed abrading-wheel or grindstone.

The object of my invention is to produce a simple and effective meansfor mounting the parts, whereby the article is pressed against theabrading-wheel and caused to slowly revolve; and it consists in thefeatures and combination of parts hereinafter described, and covered inthe claims.

In the accompanying drawings, Figure 1 represents a side elevation,andFig. 2 a front elevation,of a machine embodying myinvention; Fig. 3, aplan with the clamping device removed to expose certain parts of theapparatus; and Fig. 4 a plan, on an enlarged scale, of the arrangementfor pivoting the chuck and its actuating mechanism.

The machine consists, broadly, in a stationary ahrading-wheel S and achuck or clamping device 0, journaled in a rocking frame A and adaptedto be held up against the abrading or grinding wheel S by a Weightedlever H, preferably journaled with the rocking while the actuatingmechanism for slowly revolving the chuck transversely to the revolutionof the abrading-wheel is mounted in said rocking frame. For this purposethe vertically-adjustable support S terminates in a forked bracket,intou hoseendsssare threaded pointed screws (Z, upon which is journaled aspindle B, adapted to revolve with ease. Upon this spindle is mountedthe forked carrier A for the oval apparatus, keyed thereto at both endsa a. This carrier is designed for the recepception of the oval apparatusor chuck O, as well as its actuating device. The latter consists of asleeve 13', provided with the wormwheel 0, integral therewith andsituated below the oval apparatus and the worm (l, together with thestepped pulley F cast integral with sleeve B The two latter parts areadapted to turn loosely on the spindle l3 and are held in determinedposition by the steel ring 0. The worm-Wheel C is journaled in an eye ofthe carrier A and actuates the superimposed chuck or oval apparatus 0,carrying the article to be ground. A lever H is keyed to the spindle B.This lever is provided with an adjustable counter-weight G at one end,said weight being for the purpose of balancing the Weight of the carrierA, oval apparatus 0, together with the article operated on and theactuating device or motor, and also for pressing the said articleagainst the grinding-disk S The other end of this lever II impingesagainst a set-screw h after the grinding operation has been completed.So long as this is not the case, the article is pressed against thegrinding-disk S", the points of the screws d forming the pivot on whichthe carrier A turns during the grinding operation. When the lever Hbears against the set-screw h, the pressure of the article to be groundceases and an elliptical motion of the same on the oval apparatusensues, the grinding-point and plane of grinding remaining unchanged.Hence the same angle of grinding-zI. a, the same breadth of bevel-ispreserved. The eccentricity of the ovals isproduced by means of threadedspindle V in the support S the latter being connected with the ovalapparatus.

The adjustment of the angle of the bevel to be imparted to the glassesmay be effected by raising or lowering the support S by means of thescrew-spindle V.

In order to grind glasses of different sizes, the support S isvertically and horizontally adjustable by the screw-spindles V and VRotation is imparted to the stepped pulley F on spindle B from thestepped pulley F, mounted on the axle of the grindstone, the saidstepped pulley also serving to adjust the velocity of rotation of thearticle to be ground. The supports S and S are attached to a frame Theclamping and pressing of the article against the grindstone is performedin the well-known manner by means of the device designated by E. i

I again point out as novel and distinguish from the known and existingoval grindingmachines the fixed unchangeable position of the center ofthe grindstone during the grinding operation, the pivoted and rockingarrangement of the article to be ground, together with the ovalapparatusand actuating device for the same, and also the adjustability of thepressure of the article on the grindstone and the automatic suspensionof the latter as soon as the article has attained a certain angle.

' I claim 1. In a grinding-machine, the combination of an abrading-wheeland a spindle j ournaled in a support, as S, with a carrier, as A, keyedto the spindle, a clutch for the article to be ground, mounted thereon,a sleeve loosely mounted on the spindle, and connections between thesleeve and the clutch for rotating the said clutch, substantially as setforth.

2. In agrinding-machine, an abrading-Wheel mounted on a fixed support, aforked bracket,

as S, and a spindle journaled in the forked bracket, in combination witha forked support, as A, keyed to the spindle and having a chuck providedwith a worm-wheel j ournaled therein, and .a sleeve loosely mounted onthe spindle and provided with a worm engaging the worm-wheel on thechuck, substantially as set forth.

3. In a grinding-machine, the combination of a fixed abrading-Wheel witha chuck mounted in a rocking frame, and means for yieldin gly holdingthe chuck against the abradingwheel, substantially as set forth.

with a fixed abrading-wheel and a chuck mounted on a rocking support, ofalever keyed to the journal of the rocking support and provided with anadjustable counter-weight arranged oppositely to the chuck,substantially as set forth.

7. Ina grinding-machine, the combination,

with a fixed abrading-wheel and a chuck mounted on a rocking support, ofa lever keyed to the journal of the rocking support and provided with acounter-weight and a stop, as h, against which the lever impinges toarrest the grinding action, substantially asset'forth. In testimonywhereof I have signed-this specification in the presence of twosubscribin g witnesses.

.ROBERT FRIEDEL. Witnesses:

AUGUST B. DROUTZ, ANT HERRMANN.

